Note 10 - Other Comprehensive Income (Details) - Changes in Each Component of Accumulated Other Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at Beginning of Period	$ 3,146	$ 1,838	$ 2,647	$ (3,319)
Three Months Ended September 30, 2014
Other comprehensive income (loss) before reclassifications	(1,869)	(326)	(72)	4,837
Amounts reclassified from accumulated other comprehensive income	(36)		(1,334)	(6)
Net other comprehensive income (loss) during period	(1,905)	(326)	(1,406)	4,831
Balance at End of Period	1,241	1,512	1,241	1,512
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at Beginning of Period	3,146	1,838	2,647	(3,319)
Three Months Ended September 30, 2014
Other comprehensive income (loss) before reclassifications	2,107	(326)	1,995	4,837
Amounts reclassified from accumulated other comprehensive income	(36)		(1,334)	(6)
Net other comprehensive income (loss) during period	2,071	(326)	661	4,831
Balance at End of Period	5,217	$ 1,512	5,217	$ 1,512
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Three Months Ended September 30, 2014
Other comprehensive income (loss) before reclassifications	(3,976)		(2,067)
Net other comprehensive income (loss) during period	(3,976)		(2,067)
Balance at End of Period	$ (3,976)		$ (3,976)